01-23-2015, 01:52 AM
(This post was last modified: 01-23-2015, 01:55 AM by Dyssomniac.)
This morning shortly before I got up, I became aware of a kind of flopping sound coming from the L-fitting that connects my Airfit F10 mask to the tubing from the machine. I soon got up and didn't think about it right away.
Then this evening when I first turned the machine on, the flopping sound was back and very pronounced. (Amplified by the airspace in the tubing, the sound is quite loud, and would keep me up, and probably my wife as well.) I see kind of a rubberized flap inside the L-fitting that I gather is designed to direct exhaled air out a vent hole, and I can only think that it's this flap that's not working correctly.
I tried washing and drying the L-fitting, but this didn't improve it. I then noticed that I had an identical L-fitting from a previous mask I'd tried, and I swapped this in to see if it would help. Unfortunately, the sound persisted. (This seemed odd to me that two of the L-fittings would fail in the same way at the same time.) I also tried swapping masks, but the problem remained. The only thing I didn't swap out was the hose, but it's hard to see how this would cause the problem.
Has anyone encountered this? Is there an easy fix? I can call the DME supplier in the morning and see how soon I can get them to send me a new one, but I may be CPAP-less for the time being unless I can figure out a way to fix it.
01-23-2015, 09:21 AM
(This post was last modified: 01-23-2015, 09:27 AM by surferdude2.)
That sounds like you may not be getting enough pressure (or possibly intermittent pressure) from your flow generator to hold the emergency expiration valve closed. I suspect the reason may be you have started using the humidifier recently. That valve should never be "flapping" except when you shut the flow generator down while using the humidifier and it goes into the cool down mode and you exhale into the mask. During that time, the flow is reduced and will give the symptoms you describe. It's the life saver feature that keeps you from suffocating when the machine goes down while you're asleep. Test it without the humidifier attached or activated.
Thanks. The night before this problem first cropped up, I had put the machine into manual humidification mode, and it went through a fair amount of water during the night. However, before the next time I used the machine I'd put it back into auto humidification mode, the same configuration I'd been using for 2-3 months.
I'll try it without the humidifier, but I'm not clear on the relationship here. How exactly is it that using the humidifier can cause the air pressure to decrease?